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<span id="648">648</span>
<span id="649">649</span>
<span id="650">650</span>
<span id="651">651</span>
<span id="652">652</span>
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<span id="664">664</span>
<span id="665">665</span>
<span id="666">666</span>
<span id="667">667</span>
<span id="668">668</span>
<span id="669">669</span>
<span id="670">670</span>
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<span id="673">673</span>
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<span id="686">686</span>
<span id="687">687</span>
<span id="688">688</span>
<span id="689">689</span>
<span id="690">690</span>
<span id="691">691</span>
<span id="692">692</span>
<span id="693">693</span>
<span id="694">694</span>
<span id="695">695</span>
<span id="696">696</span>
<span id="697">697</span>
<span id="698">698</span>
<span id="699">699</span>
<span id="700">700</span>
<span id="701">701</span>
<span id="702">702</span>
<span id="703">703</span>
<span id="704">704</span>
<span id="705">705</span>
<span id="706">706</span>
<span id="707">707</span>
<span id="708">708</span>
<span id="709">709</span>
<span id="710">710</span>
<span id="711">711</span>
<span id="712">712</span>
<span id="713">713</span>
<span id="714">714</span>
<span id="715">715</span>
<span id="716">716</span>
<span id="717">717</span>
<span id="718">718</span>
<span id="719">719</span>
<span id="720">720</span>
<span id="721">721</span>
<span id="722">722</span>
<span id="723">723</span>
<span id="724">724</span>
<span id="725">725</span>
<span id="726">726</span>
<span id="727">727</span>
<span id="728">728</span>
<span id="729">729</span>
<span id="730">730</span>
<span id="731">731</span>
<span id="732">732</span>
<span id="733">733</span>
<span id="734">734</span>
<span id="735">735</span>
<span id="736">736</span>
<span id="737">737</span>
<span id="738">738</span>
<span id="739">739</span>
<span id="740">740</span>
<span id="741">741</span>
<span id="742">742</span>
<span id="743">743</span>
<span id="744">744</span>
<span id="745">745</span>
<span id="746">746</span>
<span id="747">747</span>
<span id="748">748</span>
<span id="749">749</span>
<span id="750">750</span>
<span id="751">751</span>
<span id="752">752</span>
<span id="753">753</span>
<span id="754">754</span>
<span id="755">755</span>
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<span id="762">762</span>
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<span id="766">766</span>
<span id="767">767</span>
<span id="768">768</span>
<span id="769">769</span>
<span id="770">770</span>
<span id="771">771</span>
<span id="772">772</span>
<span id="773">773</span>
<span id="774">774</span>
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<span id="776">776</span>
<span id="777">777</span>
<span id="778">778</span>
<span id="779">779</span>
<span id="780">780</span>
<span id="781">781</span>
<span id="782">782</span>
<span id="783">783</span>
<span id="784">784</span>
<span id="785">785</span>
<span id="786">786</span>
<span id="787">787</span>
<span id="788">788</span>
<span id="789">789</span>
<span id="790">790</span>
<span id="791">791</span>
<span id="792">792</span>
<span id="793">793</span>
<span id="794">794</span>
<span id="795">795</span>
<span id="796">796</span>
<span id="797">797</span>
<span id="798">798</span>
<span id="799">799</span>
<span id="800">800</span>
<span id="801">801</span>
<span id="802">802</span>
<span id="803">803</span>
<span id="804">804</span>
<span id="805">805</span>
<span id="806">806</span>
<span id="807">807</span>
<span id="808">808</span>
<span id="809">809</span>
<span id="810">810</span>
<span id="811">811</span>
<span id="812">812</span>
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<span id="814">814</span>
<span id="815">815</span>
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<span id="818">818</span>
<span id="819">819</span>
<span id="820">820</span>
<span id="821">821</span>
<span id="822">822</span>
<span id="823">823</span>
<span id="824">824</span>
<span id="825">825</span>
<span id="826">826</span>
<span id="827">827</span>
<span id="828">828</span>
<span id="829">829</span>
<span id="830">830</span>
<span id="831">831</span>
<span id="832">832</span>
<span id="833">833</span>
<span id="834">834</span>
<span id="835">835</span>
<span id="836">836</span>
<span id="837">837</span>
<span id="838">838</span>
<span id="839">839</span>
<span id="840">840</span>
<span id="841">841</span>
<span id="842">842</span>
<span id="843">843</span>
</pre><pre class='rust '>
<span class='kw'>use</span> <span class='ident'>libc</span>::{<span class='ident'>c_int</span>, <span class='ident'>c_ulong</span>, <span class='ident'>c_void</span>};
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>ffi</span>::{<span class='ident'>CStr</span>, <span class='ident'>CString</span>};
<span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>cmp</span>::<span class='ident'>Ordering</span>;
<span class='kw'>use</span> <span class='ident'>std</span>::{<span class='ident'>fmt</span>, <span class='ident'>ptr</span>, <span class='ident'>mem</span>};

<span class='kw'>use</span> <span class='ident'>ffi</span>;
<span class='kw'>use</span> <span class='ident'>ssl</span>::<span class='ident'>error</span>::<span class='ident'>SslError</span>;

<span class='doccomment'>/// A signed arbitrary-precision integer.</span>
<span class='doccomment'>///</span>
<span class='doccomment'>/// `BigNum` provides wrappers around OpenSSL&#39;s checked arithmetic functions. Additionally, it</span>
<span class='doccomment'>/// implements the standard operators (`std::ops`), which perform unchecked arithmetic, unwrapping</span>
<span class='doccomment'>/// the returned `Result` of the checked operations.</span>
<span class='kw'>pub</span> <span class='kw'>struct</span> <span class='ident'>BigNum</span>(<span class='op'>*</span><span class='kw-2'>mut</span> <span class='ident'>ffi</span>::<span class='ident'>BIGNUM</span>);

<span class='doccomment'>/// Specifies the desired properties of a randomly generated `BigNum`.</span>
<span class='attribute'>#[<span class='ident'>derive</span>(<span class='ident'>Copy</span>, <span class='ident'>Clone</span>)]</span>
<span class='attribute'>#[<span class='ident'>repr</span>(<span class='ident'>C</span>)]</span>
<span class='kw'>pub</span> <span class='kw'>enum</span> <span class='ident'>RNGProperty</span> {
    <span class='doccomment'>/// The most significant bit of the number is allowed to be 0.</span>
    <span class='ident'>MsbMaybeZero</span> <span class='op'>=</span> <span class='op'>-</span><span class='number'>1</span>,
    <span class='doccomment'>/// The MSB should be set to 1.</span>
    <span class='ident'>MsbOne</span> <span class='op'>=</span> <span class='number'>0</span>,
    <span class='doccomment'>/// The two most significant bits of the number will be set to 1, so that the product of two</span>
    <span class='doccomment'>/// such random numbers will always have `2 * bits` length.</span>
    <span class='ident'>TwoMsbOne</span> <span class='op'>=</span> <span class='number'>1</span>,
}

<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>with_ctx</span>(
    (<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>:<span class='ident'>ident</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>action</span>:<span class='ident'>block</span>) <span class='op'>=&gt;</span> ({
        <span class='kw'>let</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span> <span class='op'>=</span> <span class='ident'>ffi</span>::<span class='ident'>BN_CTX_new</span>();
        <span class='kw'>if</span> (<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>).<span class='ident'>is_null</span>() {
            <span class='prelude-val'>Err</span>(<span class='ident'>SslError</span>::<span class='ident'>get</span>())
        } <span class='kw'>else</span> {
            <span class='kw'>let</span> <span class='ident'>r</span> <span class='op'>=</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>action</span>;
            <span class='ident'>ffi</span>::<span class='ident'>BN_CTX_free</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>);
            <span class='ident'>r</span>
        }
    });
);

<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>with_bn</span>(
    (<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>:<span class='ident'>ident</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>action</span>:<span class='ident'>block</span>) <span class='op'>=&gt;</span> ({
        <span class='kw'>let</span> <span class='ident'>tmp</span> <span class='op'>=</span> <span class='ident'>BigNum</span>::<span class='ident'>new</span>();
        <span class='kw'>match</span> <span class='ident'>tmp</span> {
            <span class='prelude-val'>Ok</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>) <span class='op'>=&gt;</span> {
                <span class='kw'>if</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>action</span> {
                    <span class='prelude-val'>Ok</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>)
                } <span class='kw'>else</span> {
                    <span class='prelude-val'>Err</span>(<span class='ident'>SslError</span>::<span class='ident'>get</span>())
                }
            },
            <span class='prelude-val'>Err</span>(<span class='ident'>err</span>) <span class='op'>=&gt;</span> <span class='prelude-val'>Err</span>(<span class='ident'>err</span>),
        }
    });
);

<span class='macro'>macro_rules</span><span class='macro'>!</span> <span class='ident'>with_bn_in_ctx</span>(
    (<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>:<span class='ident'>ident</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ctx_name</span>:<span class='ident'>ident</span>, <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>action</span>:<span class='ident'>block</span>) <span class='op'>=&gt;</span> ({
        <span class='kw'>let</span> <span class='ident'>tmp</span> <span class='op'>=</span> <span class='ident'>BigNum</span>::<span class='ident'>new</span>();
        <span class='kw'>match</span> <span class='ident'>tmp</span> {
            <span class='prelude-val'>Ok</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>) <span class='op'>=&gt;</span> {
                <span class='kw'>let</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ctx_name</span> <span class='op'>=</span> <span class='ident'>ffi</span>::<span class='ident'>BN_CTX_new</span>();
                <span class='kw'>if</span> (<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ctx_name</span>).<span class='ident'>is_null</span>() {
                    <span class='prelude-val'>Err</span>(<span class='ident'>SslError</span>::<span class='ident'>get</span>())
                } <span class='kw'>else</span> {
                    <span class='kw'>let</span> <span class='ident'>r</span> <span class='op'>=</span>
                        <span class='kw'>if</span> <span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>action</span> {
                            <span class='prelude-val'>Ok</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>name</span>)
                        } <span class='kw'>else</span> {
                            <span class='prelude-val'>Err</span>(<span class='ident'>SslError</span>::<span class='ident'>get</span>())
                        };
                    <span class='ident'>ffi</span>::<span class='ident'>BN_CTX_free</span>(<span class='macro-nonterminal'>$</span><span class='macro-nonterminal'>ctx_name</span>);
                    <span class='ident'>r</span>
                }
            },
            <span class='prelude-val'>Err</span>(<span class='ident'>err</span>) <span class='op'>=&gt;</span> <span class='prelude-val'>Err</span>(<span class='ident'>err</span>),
        }
    });
);

<span class='kw'>impl</span> <span class='ident'>BigNum</span> {
    <span class='doccomment'>/// Creates a new `BigNum` with the value 0.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new</span>() <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='ident'>ffi</span>::<span class='ident'>init</span>();

            <span class='kw'>let</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='macro'>try_ssl_null</span><span class='macro'>!</span>(<span class='ident'>ffi</span>::<span class='ident'>BN_new</span>());
            <span class='prelude-val'>Ok</span>(<span class='ident'>BigNum</span>(<span class='ident'>v</span>))
        }
    }

    <span class='doccomment'>/// Creates a new `BigNum` with the given value.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new_from</span>(<span class='ident'>n</span>: <span class='ident'>u64</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='ident'>BigNum</span>::<span class='ident'>new</span>().<span class='ident'>and_then</span>(<span class='op'>|</span><span class='ident'>v</span><span class='op'>|</span> <span class='kw'>unsafe</span> {
            <span class='macro'>try_ssl</span><span class='macro'>!</span>(<span class='ident'>ffi</span>::<span class='ident'>BN_set_word</span>(<span class='ident'>v</span>.<span class='ident'>raw</span>(), <span class='ident'>n</span> <span class='kw'>as</span> <span class='ident'>c_ulong</span>));
            <span class='prelude-val'>Ok</span>(<span class='ident'>v</span>)
        })
    }

    <span class='doccomment'>/// Creates a `BigNum` from a decimal string.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>from_dec_str</span>(<span class='ident'>s</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='ident'>BigNum</span>::<span class='ident'>new</span>().<span class='ident'>and_then</span>(<span class='op'>|</span><span class='ident'>v</span><span class='op'>|</span> <span class='kw'>unsafe</span> {
            <span class='kw'>let</span> <span class='ident'>c_str</span> <span class='op'>=</span> <span class='ident'>CString</span>::<span class='ident'>new</span>(<span class='ident'>s</span>.<span class='ident'>as_bytes</span>()).<span class='ident'>unwrap</span>();
            <span class='macro'>try_ssl</span><span class='macro'>!</span>(<span class='ident'>ffi</span>::<span class='ident'>BN_dec2bn</span>(<span class='ident'>v</span>.<span class='ident'>raw_ptr</span>(), <span class='ident'>c_str</span>.<span class='ident'>as_ptr</span>() <span class='kw'>as</span> <span class='op'>*</span><span class='kw'>const</span> _));
            <span class='prelude-val'>Ok</span>(<span class='ident'>v</span>)
        })
    }

    <span class='doccomment'>/// Creates a `BigNum` from a hexadecimal string.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>from_hex_str</span>(<span class='ident'>s</span>: <span class='kw-2'>&amp;</span><span class='ident'>str</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='ident'>BigNum</span>::<span class='ident'>new</span>().<span class='ident'>and_then</span>(<span class='op'>|</span><span class='ident'>v</span><span class='op'>|</span> <span class='kw'>unsafe</span> {
            <span class='kw'>let</span> <span class='ident'>c_str</span> <span class='op'>=</span> <span class='ident'>CString</span>::<span class='ident'>new</span>(<span class='ident'>s</span>.<span class='ident'>as_bytes</span>()).<span class='ident'>unwrap</span>();
            <span class='macro'>try_ssl</span><span class='macro'>!</span>(<span class='ident'>ffi</span>::<span class='ident'>BN_hex2bn</span>(<span class='ident'>v</span>.<span class='ident'>raw_ptr</span>(), <span class='ident'>c_str</span>.<span class='ident'>as_ptr</span>() <span class='kw'>as</span> <span class='op'>*</span><span class='kw'>const</span> _));
            <span class='prelude-val'>Ok</span>(<span class='ident'>v</span>)
        })
    }

    <span class='kw'>pub</span> <span class='kw'>unsafe</span> <span class='kw'>fn</span> <span class='ident'>new_from_ffi</span>(<span class='ident'>orig</span>: <span class='op'>*</span><span class='kw-2'>mut</span> <span class='ident'>ffi</span>::<span class='ident'>BIGNUM</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>if</span> <span class='ident'>orig</span>.<span class='ident'>is_null</span>() {
            <span class='macro'>panic</span><span class='macro'>!</span>(<span class='string'>&quot;Null Pointer was supplied to BigNum::new_from_ffi&quot;</span>);
        }
        <span class='kw'>let</span> <span class='ident'>r</span> <span class='op'>=</span> <span class='ident'>ffi</span>::<span class='ident'>BN_dup</span>(<span class='ident'>orig</span>);
        <span class='kw'>if</span> <span class='ident'>r</span>.<span class='ident'>is_null</span>() {
            <span class='prelude-val'>Err</span>(<span class='ident'>SslError</span>::<span class='ident'>get</span>())
        } <span class='kw'>else</span> {
            <span class='prelude-val'>Ok</span>(<span class='ident'>BigNum</span>(<span class='ident'>r</span>))
        }
    }

    <span class='doccomment'>/// Creates a new `BigNum` from an unsigned, big-endian encoded number of arbitrary length.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// ```</span>
    <span class='doccomment'>/// # use openssl::bn::BigNum;</span>
    <span class='doccomment'>/// let bignum = BigNum::new_from_slice(&amp;[0x12, 0x00, 0x34]).unwrap();</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// assert_eq!(bignum, BigNum::new_from(0x120034).unwrap());</span>
    <span class='doccomment'>/// ```</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>new_from_slice</span>(<span class='ident'>n</span>: <span class='kw-2'>&amp;</span>[<span class='ident'>u8</span>]) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='ident'>BigNum</span>::<span class='ident'>new</span>().<span class='ident'>and_then</span>(<span class='op'>|</span><span class='ident'>v</span><span class='op'>|</span> <span class='kw'>unsafe</span> {
            <span class='macro'>try_ssl_null</span><span class='macro'>!</span>(<span class='ident'>ffi</span>::<span class='ident'>BN_bin2bn</span>(<span class='ident'>n</span>.<span class='ident'>as_ptr</span>(), <span class='ident'>n</span>.<span class='ident'>len</span>() <span class='kw'>as</span> <span class='ident'>c_int</span>, <span class='ident'>v</span>.<span class='ident'>raw</span>()));
            <span class='prelude-val'>Ok</span>(<span class='ident'>v</span>)
        })
    }

    <span class='doccomment'>/// Returns the square of `self`.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// ```</span>
    <span class='doccomment'>/// # use openssl::bn::BigNum;</span>
    <span class='doccomment'>/// let ref n = BigNum::new_from(10).unwrap();</span>
    <span class='doccomment'>/// let squared = BigNum::new_from(100).unwrap();</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// assert_eq!(n.checked_sqr().unwrap(), squared);</span>
    <span class='doccomment'>/// assert_eq!(n * n, squared);</span>
    <span class='doccomment'>/// ```</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_sqr</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn_in_ctx</span><span class='macro'>!</span>(<span class='ident'>r</span>, <span class='ident'>ctx</span>, {
                <span class='ident'>ffi</span>::<span class='ident'>BN_sqr</span>(<span class='ident'>r</span>.<span class='ident'>raw</span>(), <span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>ctx</span>) <span class='op'>==</span> <span class='number'>1</span>
            })
        }
    }

    <span class='doccomment'>/// Returns the unsigned remainder of the division `self / n`.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_nnmod</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>n</span>: <span class='kw-2'>&amp;</span><span class='ident'>BigNum</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn_in_ctx</span><span class='macro'>!</span>(<span class='ident'>r</span>, <span class='ident'>ctx</span>, {
                <span class='ident'>ffi</span>::<span class='ident'>BN_nnmod</span>(<span class='ident'>r</span>.<span class='ident'>raw</span>(), <span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>n</span>.<span class='ident'>raw</span>(), <span class='ident'>ctx</span>) <span class='op'>==</span> <span class='number'>1</span>
            })
        }
    }

    <span class='doccomment'>/// Equivalent to `(self + a) mod n`.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// ```</span>
    <span class='doccomment'>/// # use openssl::bn::BigNum;</span>
    <span class='doccomment'>/// let ref s = BigNum::new_from(10).unwrap();</span>
    <span class='doccomment'>/// let ref a = BigNum::new_from(20).unwrap();</span>
    <span class='doccomment'>/// let ref n = BigNum::new_from(29).unwrap();</span>
    <span class='doccomment'>/// let result = BigNum::new_from(1).unwrap();</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// assert_eq!(s.checked_mod_add(a, n).unwrap(), result);</span>
    <span class='doccomment'>/// ```</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_mod_add</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>a</span>: <span class='kw-2'>&amp;</span><span class='ident'>BigNum</span>, <span class='ident'>n</span>: <span class='kw-2'>&amp;</span><span class='ident'>BigNum</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn_in_ctx</span><span class='macro'>!</span>(<span class='ident'>r</span>, <span class='ident'>ctx</span>, {
                <span class='ident'>ffi</span>::<span class='ident'>BN_mod_add</span>(<span class='ident'>r</span>.<span class='ident'>raw</span>(), <span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>a</span>.<span class='ident'>raw</span>(), <span class='ident'>n</span>.<span class='ident'>raw</span>(), <span class='ident'>ctx</span>) <span class='op'>==</span> <span class='number'>1</span>
            })
        }
    }

    <span class='doccomment'>/// Equivalent to `(self - a) mod n`.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_mod_sub</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>a</span>: <span class='kw-2'>&amp;</span><span class='ident'>BigNum</span>, <span class='ident'>n</span>: <span class='kw-2'>&amp;</span><span class='ident'>BigNum</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn_in_ctx</span><span class='macro'>!</span>(<span class='ident'>r</span>, <span class='ident'>ctx</span>, {
                <span class='ident'>ffi</span>::<span class='ident'>BN_mod_sub</span>(<span class='ident'>r</span>.<span class='ident'>raw</span>(), <span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>a</span>.<span class='ident'>raw</span>(), <span class='ident'>n</span>.<span class='ident'>raw</span>(), <span class='ident'>ctx</span>) <span class='op'>==</span> <span class='number'>1</span>
            })
        }
    }

    <span class='doccomment'>/// Equivalent to `(self * a) mod n`.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_mod_mul</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>a</span>: <span class='kw-2'>&amp;</span><span class='ident'>BigNum</span>, <span class='ident'>n</span>: <span class='kw-2'>&amp;</span><span class='ident'>BigNum</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn_in_ctx</span><span class='macro'>!</span>(<span class='ident'>r</span>, <span class='ident'>ctx</span>, {
                <span class='ident'>ffi</span>::<span class='ident'>BN_mod_mul</span>(<span class='ident'>r</span>.<span class='ident'>raw</span>(), <span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>a</span>.<span class='ident'>raw</span>(), <span class='ident'>n</span>.<span class='ident'>raw</span>(), <span class='ident'>ctx</span>) <span class='op'>==</span> <span class='number'>1</span>
            })
        }
    }

    <span class='doccomment'>/// Equivalent to `self² mod n`.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_mod_sqr</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>n</span>: <span class='kw-2'>&amp;</span><span class='ident'>BigNum</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn_in_ctx</span><span class='macro'>!</span>(<span class='ident'>r</span>, <span class='ident'>ctx</span>, {
                <span class='ident'>ffi</span>::<span class='ident'>BN_mod_sqr</span>(<span class='ident'>r</span>.<span class='ident'>raw</span>(), <span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>n</span>.<span class='ident'>raw</span>(), <span class='ident'>ctx</span>) <span class='op'>==</span> <span class='number'>1</span>
            })
        }
    }

    <span class='doccomment'>/// Raises `self` to the `p`th power.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_exp</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='ident'>BigNum</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn_in_ctx</span><span class='macro'>!</span>(<span class='ident'>r</span>, <span class='ident'>ctx</span>, {
                <span class='ident'>ffi</span>::<span class='ident'>BN_exp</span>(<span class='ident'>r</span>.<span class='ident'>raw</span>(), <span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>p</span>.<span class='ident'>raw</span>(), <span class='ident'>ctx</span>) <span class='op'>==</span> <span class='number'>1</span>
            })
        }
    }

    <span class='doccomment'>/// Equivalent to `self.checked_exp(p) mod n`.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_mod_exp</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>p</span>: <span class='kw-2'>&amp;</span><span class='ident'>BigNum</span>, <span class='ident'>n</span>: <span class='kw-2'>&amp;</span><span class='ident'>BigNum</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn_in_ctx</span><span class='macro'>!</span>(<span class='ident'>r</span>, <span class='ident'>ctx</span>, {
                <span class='ident'>ffi</span>::<span class='ident'>BN_mod_exp</span>(<span class='ident'>r</span>.<span class='ident'>raw</span>(), <span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>p</span>.<span class='ident'>raw</span>(), <span class='ident'>n</span>.<span class='ident'>raw</span>(), <span class='ident'>ctx</span>) <span class='op'>==</span> <span class='number'>1</span>
            })
        }
    }

    <span class='doccomment'>/// Calculates the modular multiplicative inverse of `self` modulo `n`, that is, an integer `r`</span>
    <span class='doccomment'>/// such that `(self * r) % n == 1`.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_mod_inv</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>n</span>: <span class='kw-2'>&amp;</span><span class='ident'>BigNum</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn_in_ctx</span><span class='macro'>!</span>(<span class='ident'>r</span>, <span class='ident'>ctx</span>, {
                <span class='op'>!</span><span class='ident'>ffi</span>::<span class='ident'>BN_mod_inverse</span>(<span class='ident'>r</span>.<span class='ident'>raw</span>(), <span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>n</span>.<span class='ident'>raw</span>(), <span class='ident'>ctx</span>).<span class='ident'>is_null</span>()
            })
        }
    }

    <span class='doccomment'>/// Add an `unsigned long` to `self`. This is more efficient than adding a `BigNum`.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>add_word</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>w</span>: <span class='ident'>c_ulong</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span>(), <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='kw'>if</span> <span class='ident'>ffi</span>::<span class='ident'>BN_add_word</span>(<span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>w</span>) <span class='op'>==</span> <span class='number'>1</span> {
                <span class='prelude-val'>Ok</span>(())
            } <span class='kw'>else</span> {
                <span class='prelude-val'>Err</span>(<span class='ident'>SslError</span>::<span class='ident'>get</span>())
            }
        }
    }

    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>sub_word</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>w</span>: <span class='ident'>c_ulong</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span>(), <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='kw'>if</span> <span class='ident'>ffi</span>::<span class='ident'>BN_sub_word</span>(<span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>w</span>) <span class='op'>==</span> <span class='number'>1</span> {
                <span class='prelude-val'>Ok</span>(())
            } <span class='kw'>else</span> {
                <span class='prelude-val'>Err</span>(<span class='ident'>SslError</span>::<span class='ident'>get</span>())
            }
        }
    }

    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>mul_word</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>w</span>: <span class='ident'>c_ulong</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span>(), <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='kw'>if</span> <span class='ident'>ffi</span>::<span class='ident'>BN_mul_word</span>(<span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>w</span>) <span class='op'>==</span> <span class='number'>1</span> {
                <span class='prelude-val'>Ok</span>(())
            } <span class='kw'>else</span> {
                <span class='prelude-val'>Err</span>(<span class='ident'>SslError</span>::<span class='ident'>get</span>())
            }
        }
    }

    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>div_word</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>w</span>: <span class='ident'>c_ulong</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>c_ulong</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='kw'>let</span> <span class='ident'>result</span> <span class='op'>=</span> <span class='ident'>ffi</span>::<span class='ident'>BN_div_word</span>(<span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>w</span>);
            <span class='kw'>if</span> <span class='ident'>result</span> <span class='op'>!=</span> <span class='op'>!</span><span class='number'>0</span> <span class='kw'>as</span> <span class='ident'>c_ulong</span> {
                <span class='prelude-val'>Ok</span>(<span class='ident'>result</span>)
            } <span class='kw'>else</span> {
                <span class='prelude-val'>Err</span>(<span class='ident'>SslError</span>::<span class='ident'>get</span>())
            }
        }
    }

    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>mod_word</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>w</span>: <span class='ident'>c_ulong</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>c_ulong</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='kw'>let</span> <span class='ident'>result</span> <span class='op'>=</span> <span class='ident'>ffi</span>::<span class='ident'>BN_mod_word</span>(<span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>w</span>);
            <span class='kw'>if</span> <span class='ident'>result</span> <span class='op'>!=</span> <span class='op'>!</span><span class='number'>0</span> <span class='kw'>as</span> <span class='ident'>c_ulong</span> {
                <span class='prelude-val'>Ok</span>(<span class='ident'>result</span>)
            } <span class='kw'>else</span> {
                <span class='prelude-val'>Err</span>(<span class='ident'>SslError</span>::<span class='ident'>get</span>())
            }
        }
    }

    <span class='doccomment'>/// Computes the greatest common denominator of `self` and `a`.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_gcd</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>a</span>: <span class='kw-2'>&amp;</span><span class='ident'>BigNum</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn_in_ctx</span><span class='macro'>!</span>(<span class='ident'>r</span>, <span class='ident'>ctx</span>, {
                <span class='ident'>ffi</span>::<span class='ident'>BN_gcd</span>(<span class='ident'>r</span>.<span class='ident'>raw</span>(), <span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>a</span>.<span class='ident'>raw</span>(), <span class='ident'>ctx</span>) <span class='op'>==</span> <span class='number'>1</span>
            })
        }
    }

    <span class='doccomment'>/// Generates a prime number.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// # Parameters</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// * `bits`: The length of the prime in bits (lower bound).</span>
    <span class='doccomment'>/// * `safe`: If true, returns a &quot;safe&quot; prime `p` so that `(p-1)/2` is also prime.</span>
    <span class='doccomment'>/// * `add`/`rem`: If `add` is set to `Some(add)`, `p % add == rem` will hold, where `p` is the</span>
    <span class='doccomment'>///   generated prime and `rem` is `1` if not specified (`None`).</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_generate_prime</span>(<span class='ident'>bits</span>: <span class='ident'>i32</span>,
                                  <span class='ident'>safe</span>: <span class='ident'>bool</span>,
                                  <span class='ident'>add</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span><span class='ident'>BigNum</span><span class='op'>&gt;</span>,
                                  <span class='ident'>rem</span>: <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span><span class='ident'>BigNum</span><span class='op'>&gt;</span>)
                                  <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn_in_ctx</span><span class='macro'>!</span>(<span class='ident'>r</span>, <span class='ident'>ctx</span>, {
                <span class='kw'>let</span> <span class='ident'>add_arg</span> <span class='op'>=</span> <span class='ident'>add</span>.<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>a</span><span class='op'>|</span> <span class='ident'>a</span>.<span class='ident'>raw</span>()).<span class='ident'>unwrap_or</span>(<span class='ident'>ptr</span>::<span class='ident'>null_mut</span>());
                <span class='kw'>let</span> <span class='ident'>rem_arg</span> <span class='op'>=</span> <span class='ident'>rem</span>.<span class='ident'>map</span>(<span class='op'>|</span><span class='ident'>r</span><span class='op'>|</span> <span class='ident'>r</span>.<span class='ident'>raw</span>()).<span class='ident'>unwrap_or</span>(<span class='ident'>ptr</span>::<span class='ident'>null_mut</span>());

                <span class='ident'>ffi</span>::<span class='ident'>BN_generate_prime_ex</span>(<span class='ident'>r</span>.<span class='ident'>raw</span>(),
                                          <span class='ident'>bits</span> <span class='kw'>as</span> <span class='ident'>c_int</span>,
                                          <span class='ident'>safe</span> <span class='kw'>as</span> <span class='ident'>c_int</span>,
                                          <span class='ident'>add_arg</span>,
                                          <span class='ident'>rem_arg</span>,
                                          <span class='ident'>ptr</span>::<span class='ident'>null</span>()) <span class='op'>==</span> <span class='number'>1</span>
            })
        }
    }

    <span class='doccomment'>/// Checks whether `self` is prime.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// Performs a Miller-Rabin probabilistic primality test with `checks` iterations.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// # Return Value</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// Returns `true` if `self` is prime with an error probability of less than `0.25 ^ checks`.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>is_prime</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>checks</span>: <span class='ident'>i32</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>bool</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_ctx</span><span class='macro'>!</span>(<span class='ident'>ctx</span>, {
                <span class='prelude-val'>Ok</span>(<span class='ident'>ffi</span>::<span class='ident'>BN_is_prime_ex</span>(<span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>checks</span> <span class='kw'>as</span> <span class='ident'>c_int</span>, <span class='ident'>ctx</span>, <span class='ident'>ptr</span>::<span class='ident'>null</span>()) <span class='op'>==</span> <span class='number'>1</span>)
            })
        }
    }

    <span class='doccomment'>/// Checks whether `self` is prime with optional trial division.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// If `do_trial_division` is `true`, first performs trial division by a number of small primes.</span>
    <span class='doccomment'>/// Then, like `is_prime`, performs a Miller-Rabin probabilistic primality test with `checks`</span>
    <span class='doccomment'>/// iterations.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// # Return Value</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// Returns `true` if `self` is prime with an error probability of less than `0.25 ^ checks`.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>is_prime_fast</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>checks</span>: <span class='ident'>i32</span>, <span class='ident'>do_trial_division</span>: <span class='ident'>bool</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>bool</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_ctx</span><span class='macro'>!</span>(<span class='ident'>ctx</span>, {
                <span class='prelude-val'>Ok</span>(<span class='ident'>ffi</span>::<span class='ident'>BN_is_prime_fasttest_ex</span>(<span class='self'>self</span>.<span class='ident'>raw</span>(),
                                                <span class='ident'>checks</span> <span class='kw'>as</span> <span class='ident'>c_int</span>,
                                                <span class='ident'>ctx</span>,
                                                <span class='ident'>do_trial_division</span> <span class='kw'>as</span> <span class='ident'>c_int</span>,
                                                <span class='ident'>ptr</span>::<span class='ident'>null</span>()) <span class='op'>==</span> <span class='number'>1</span>)
            })
        }
    }

    <span class='doccomment'>/// Generates a cryptographically strong pseudo-random `BigNum`.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// # Parameters</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// * `bits`: Length of the number in bits.</span>
    <span class='doccomment'>/// * `prop`: The desired properties of the number.</span>
    <span class='doccomment'>/// * `odd`: If `true`, the generated number will be odd.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_new_random</span>(<span class='ident'>bits</span>: <span class='ident'>i32</span>, <span class='ident'>prop</span>: <span class='ident'>RNGProperty</span>, <span class='ident'>odd</span>: <span class='ident'>bool</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn_in_ctx</span><span class='macro'>!</span>(<span class='ident'>r</span>, <span class='ident'>ctx</span>, {
                <span class='ident'>ffi</span>::<span class='ident'>BN_rand</span>(<span class='ident'>r</span>.<span class='ident'>raw</span>(), <span class='ident'>bits</span> <span class='kw'>as</span> <span class='ident'>c_int</span>, <span class='ident'>prop</span> <span class='kw'>as</span> <span class='ident'>c_int</span>, <span class='ident'>odd</span> <span class='kw'>as</span> <span class='ident'>c_int</span>) <span class='op'>==</span> <span class='number'>1</span>
            })
        }
    }

    <span class='doccomment'>/// The cryptographically weak counterpart to `checked_new_random`.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_new_pseudo_random</span>(<span class='ident'>bits</span>: <span class='ident'>i32</span>,
                                     <span class='ident'>prop</span>: <span class='ident'>RNGProperty</span>,
                                     <span class='ident'>odd</span>: <span class='ident'>bool</span>)
                                     <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn_in_ctx</span><span class='macro'>!</span>(<span class='ident'>r</span>, <span class='ident'>ctx</span>, {
                <span class='ident'>ffi</span>::<span class='ident'>BN_pseudo_rand</span>(<span class='ident'>r</span>.<span class='ident'>raw</span>(), <span class='ident'>bits</span> <span class='kw'>as</span> <span class='ident'>c_int</span>, <span class='ident'>prop</span> <span class='kw'>as</span> <span class='ident'>c_int</span>, <span class='ident'>odd</span> <span class='kw'>as</span> <span class='ident'>c_int</span>) <span class='op'>==</span> <span class='number'>1</span>
            })
        }
    }

    <span class='doccomment'>/// Generates a cryptographically strong pseudo-random `BigNum` `r` in the range</span>
    <span class='doccomment'>/// `0 &lt;= r &lt; self`.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_rand_in_range</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn_in_ctx</span><span class='macro'>!</span>(<span class='ident'>r</span>, <span class='ident'>ctx</span>, {
                <span class='ident'>ffi</span>::<span class='ident'>BN_rand_range</span>(<span class='ident'>r</span>.<span class='ident'>raw</span>(), <span class='self'>self</span>.<span class='ident'>raw</span>()) <span class='op'>==</span> <span class='number'>1</span>
            })
        }
    }

    <span class='doccomment'>/// The cryptographically weak counterpart to `checked_rand_in_range`.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_pseudo_rand_in_range</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn_in_ctx</span><span class='macro'>!</span>(<span class='ident'>r</span>, <span class='ident'>ctx</span>, {
                <span class='ident'>ffi</span>::<span class='ident'>BN_pseudo_rand_range</span>(<span class='ident'>r</span>.<span class='ident'>raw</span>(), <span class='self'>self</span>.<span class='ident'>raw</span>()) <span class='op'>==</span> <span class='number'>1</span>
            })
        }
    }

    <span class='doccomment'>/// Sets bit `n`. Equivalent to `self |= (1 &lt;&lt; n)`.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// When setting a bit outside of `self`, it is expanded.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>set_bit</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>n</span>: <span class='ident'>i32</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span>(), <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='kw'>if</span> <span class='ident'>ffi</span>::<span class='ident'>BN_set_bit</span>(<span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>n</span> <span class='kw'>as</span> <span class='ident'>c_int</span>) <span class='op'>==</span> <span class='number'>1</span> {
                <span class='prelude-val'>Ok</span>(())
            } <span class='kw'>else</span> {
                <span class='prelude-val'>Err</span>(<span class='ident'>SslError</span>::<span class='ident'>get</span>())
            }
        }
    }

    <span class='doccomment'>/// Clears bit `n`, setting it to 0. Equivalent to `self &amp;= ~(1 &lt;&lt; n)`.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// When clearing a bit outside of `self`, an error is returned.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>clear_bit</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>n</span>: <span class='ident'>i32</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span>(), <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='kw'>if</span> <span class='ident'>ffi</span>::<span class='ident'>BN_clear_bit</span>(<span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>n</span> <span class='kw'>as</span> <span class='ident'>c_int</span>) <span class='op'>==</span> <span class='number'>1</span> {
                <span class='prelude-val'>Ok</span>(())
            } <span class='kw'>else</span> {
                <span class='prelude-val'>Err</span>(<span class='ident'>SslError</span>::<span class='ident'>get</span>())
            }
        }
    }

    <span class='doccomment'>/// Returns `true` if the `n`th bit of `self` is set to 1, `false` otherwise.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>is_bit_set</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>n</span>: <span class='ident'>i32</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
        <span class='kw'>unsafe</span> { <span class='ident'>ffi</span>::<span class='ident'>BN_is_bit_set</span>(<span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>n</span> <span class='kw'>as</span> <span class='ident'>c_int</span>) <span class='op'>==</span> <span class='number'>1</span> }
    }

    <span class='doccomment'>/// Truncates `self` to the lowest `n` bits.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// An error occurs if `self` is already shorter than `n` bits.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>mask_bits</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>, <span class='ident'>n</span>: <span class='ident'>i32</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span>(), <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='kw'>if</span> <span class='ident'>ffi</span>::<span class='ident'>BN_mask_bits</span>(<span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>n</span> <span class='kw'>as</span> <span class='ident'>c_int</span>) <span class='op'>==</span> <span class='number'>1</span> {
                <span class='prelude-val'>Ok</span>(())
            } <span class='kw'>else</span> {
                <span class='prelude-val'>Err</span>(<span class='ident'>SslError</span>::<span class='ident'>get</span>())
            }
        }
    }

    <span class='doccomment'>/// Returns `self`, shifted left by 1 bit. `self` may be negative.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// ```</span>
    <span class='doccomment'>/// # use openssl::bn::BigNum;</span>
    <span class='doccomment'>/// let ref s = BigNum::new_from(0b0100).unwrap();</span>
    <span class='doccomment'>/// let result = BigNum::new_from(0b1000).unwrap();</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// assert_eq!(s.checked_shl1().unwrap(), result);</span>
    <span class='doccomment'>/// ```</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// ```</span>
    <span class='doccomment'>/// # use openssl::bn::BigNum;</span>
    <span class='doccomment'>/// let ref s = -BigNum::new_from(8).unwrap();</span>
    <span class='doccomment'>/// let result = -BigNum::new_from(16).unwrap();</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// // (-8) &lt;&lt; 1 == -16</span>
    <span class='doccomment'>/// assert_eq!(s.checked_shl1().unwrap(), result);</span>
    <span class='doccomment'>/// ```</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_shl1</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn</span><span class='macro'>!</span>(<span class='ident'>r</span>, {
                <span class='ident'>ffi</span>::<span class='ident'>BN_lshift1</span>(<span class='ident'>r</span>.<span class='ident'>raw</span>(), <span class='self'>self</span>.<span class='ident'>raw</span>()) <span class='op'>==</span> <span class='number'>1</span>
            })
        }
    }

    <span class='doccomment'>/// Returns `self`, shifted right by 1 bit. `self` may be negative.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_shr1</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn</span><span class='macro'>!</span>(<span class='ident'>r</span>, {
                <span class='ident'>ffi</span>::<span class='ident'>BN_rshift1</span>(<span class='ident'>r</span>.<span class='ident'>raw</span>(), <span class='self'>self</span>.<span class='ident'>raw</span>()) <span class='op'>==</span> <span class='number'>1</span>
            })
        }
    }

    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_add</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>a</span>: <span class='kw-2'>&amp;</span><span class='ident'>BigNum</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn</span><span class='macro'>!</span>(<span class='ident'>r</span>, {
                <span class='ident'>ffi</span>::<span class='ident'>BN_add</span>(<span class='ident'>r</span>.<span class='ident'>raw</span>(), <span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>a</span>.<span class='ident'>raw</span>()) <span class='op'>==</span> <span class='number'>1</span>
            })
        }
    }

    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_sub</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>a</span>: <span class='kw-2'>&amp;</span><span class='ident'>BigNum</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn</span><span class='macro'>!</span>(<span class='ident'>r</span>, {
                <span class='ident'>ffi</span>::<span class='ident'>BN_sub</span>(<span class='ident'>r</span>.<span class='ident'>raw</span>(), <span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>a</span>.<span class='ident'>raw</span>()) <span class='op'>==</span> <span class='number'>1</span>
            })
        }
    }

    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_mul</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>a</span>: <span class='kw-2'>&amp;</span><span class='ident'>BigNum</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn_in_ctx</span><span class='macro'>!</span>(<span class='ident'>r</span>, <span class='ident'>ctx</span>, {
                <span class='ident'>ffi</span>::<span class='ident'>BN_mul</span>(<span class='ident'>r</span>.<span class='ident'>raw</span>(), <span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>a</span>.<span class='ident'>raw</span>(), <span class='ident'>ctx</span>) <span class='op'>==</span> <span class='number'>1</span>
            })
        }
    }

    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_div</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>a</span>: <span class='kw-2'>&amp;</span><span class='ident'>BigNum</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn_in_ctx</span><span class='macro'>!</span>(<span class='ident'>r</span>, <span class='ident'>ctx</span>, {
                <span class='ident'>ffi</span>::<span class='ident'>BN_div</span>(<span class='ident'>r</span>.<span class='ident'>raw</span>(), <span class='ident'>ptr</span>::<span class='ident'>null_mut</span>(), <span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>a</span>.<span class='ident'>raw</span>(), <span class='ident'>ctx</span>) <span class='op'>==</span> <span class='number'>1</span>
            })
        }
    }

    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_mod</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>a</span>: <span class='kw-2'>&amp;</span><span class='ident'>BigNum</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn_in_ctx</span><span class='macro'>!</span>(<span class='ident'>r</span>, <span class='ident'>ctx</span>, {
                <span class='ident'>ffi</span>::<span class='ident'>BN_div</span>(<span class='ident'>ptr</span>::<span class='ident'>null_mut</span>(), <span class='ident'>r</span>.<span class='ident'>raw</span>(), <span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>a</span>.<span class='ident'>raw</span>(), <span class='ident'>ctx</span>) <span class='op'>==</span> <span class='number'>1</span>
            })
        }
    }

    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_shl</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>a</span>: <span class='kw-2'>&amp;</span><span class='ident'>i32</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn</span><span class='macro'>!</span>(<span class='ident'>r</span>, {
                <span class='ident'>ffi</span>::<span class='ident'>BN_lshift</span>(<span class='ident'>r</span>.<span class='ident'>raw</span>(), <span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='op'>*</span><span class='ident'>a</span> <span class='kw'>as</span> <span class='ident'>c_int</span>) <span class='op'>==</span> <span class='number'>1</span>
            })
        }
    }

    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>checked_shr</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>a</span>: <span class='kw-2'>&amp;</span><span class='ident'>i32</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Result</span><span class='op'>&lt;</span><span class='ident'>BigNum</span>, <span class='ident'>SslError</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='macro'>with_bn</span><span class='macro'>!</span>(<span class='ident'>r</span>, {
                <span class='ident'>ffi</span>::<span class='ident'>BN_rshift</span>(<span class='ident'>r</span>.<span class='ident'>raw</span>(), <span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='op'>*</span><span class='ident'>a</span> <span class='kw'>as</span> <span class='ident'>c_int</span>) <span class='op'>==</span> <span class='number'>1</span>
            })
        }
    }

    <span class='doccomment'>/// Inverts the sign of `self`.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// ```</span>
    <span class='doccomment'>/// # use openssl::bn::BigNum;</span>
    <span class='doccomment'>/// let mut s = BigNum::new_from(8).unwrap();</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// s.negate();</span>
    <span class='doccomment'>/// assert_eq!(s, -BigNum::new_from(8).unwrap());</span>
    <span class='doccomment'>/// s.negate();</span>
    <span class='doccomment'>/// assert_eq!(s, BigNum::new_from(8).unwrap());</span>
    <span class='doccomment'>/// ```</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>negate</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) {
        <span class='kw'>unsafe</span> { <span class='ident'>ffi</span>::<span class='ident'>BN_set_negative</span>(<span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>is_negative</span>() <span class='kw'>as</span> <span class='ident'>c_int</span>) }
    }

    <span class='doccomment'>/// Compare the absolute values of `self` and `oth`.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// ```</span>
    <span class='doccomment'>/// # use openssl::bn::BigNum;</span>
    <span class='doccomment'>/// # use std::cmp::Ordering;</span>
    <span class='doccomment'>/// let s = -BigNum::new_from(8).unwrap();</span>
    <span class='doccomment'>/// let o = BigNum::new_from(8).unwrap();</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// assert_eq!(s.abs_cmp(o), Ordering::Equal);</span>
    <span class='doccomment'>/// ```</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>abs_cmp</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>oth</span>: <span class='ident'>BigNum</span>) <span class='op'>-&gt;</span> <span class='ident'>Ordering</span> {
        <span class='kw'>unsafe</span> {
            <span class='kw'>let</span> <span class='ident'>res</span> <span class='op'>=</span> <span class='ident'>ffi</span>::<span class='ident'>BN_ucmp</span>(<span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>oth</span>.<span class='ident'>raw</span>()) <span class='kw'>as</span> <span class='ident'>i32</span>;
            <span class='kw'>if</span> <span class='ident'>res</span> <span class='op'>&lt;</span> <span class='number'>0</span> {
                <span class='ident'>Ordering</span>::<span class='ident'>Less</span>
            } <span class='kw'>else</span> <span class='kw'>if</span> <span class='ident'>res</span> <span class='op'>&gt;</span> <span class='number'>0</span> {
                <span class='ident'>Ordering</span>::<span class='ident'>Greater</span>
            } <span class='kw'>else</span> {
                <span class='ident'>Ordering</span>::<span class='ident'>Equal</span>
            }
        }
    }

    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>is_negative</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
        <span class='kw'>unsafe</span> { (<span class='op'>*</span><span class='self'>self</span>.<span class='ident'>raw</span>()).<span class='ident'>neg</span> <span class='op'>==</span> <span class='number'>1</span> }
    }

    <span class='doccomment'>/// Returns the number of significant bits in `self`.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>num_bits</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>i32</span> {
        <span class='kw'>unsafe</span> { <span class='ident'>ffi</span>::<span class='ident'>BN_num_bits</span>(<span class='self'>self</span>.<span class='ident'>raw</span>()) <span class='kw'>as</span> <span class='ident'>i32</span> }
    }

    <span class='doccomment'>/// Returns the size of `self` in bytes.</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>num_bytes</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>i32</span> {
        (<span class='self'>self</span>.<span class='ident'>num_bits</span>() <span class='op'>+</span> <span class='number'>7</span>) <span class='op'>/</span> <span class='number'>8</span>
    }

    <span class='kw'>pub</span> <span class='kw'>unsafe</span> <span class='kw'>fn</span> <span class='ident'>raw</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='op'>*</span><span class='kw-2'>mut</span> <span class='ident'>ffi</span>::<span class='ident'>BIGNUM</span> {
        <span class='kw'>let</span> <span class='ident'>BigNum</span>(<span class='ident'>n</span>) <span class='op'>=</span> <span class='op'>*</span><span class='self'>self</span>;
        <span class='ident'>n</span>
    }

    <span class='kw'>pub</span> <span class='kw'>unsafe</span> <span class='kw'>fn</span> <span class='ident'>raw_ptr</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='op'>*</span><span class='kw'>const</span> <span class='op'>*</span><span class='kw-2'>mut</span> <span class='ident'>ffi</span>::<span class='ident'>BIGNUM</span> {
        <span class='kw'>let</span> <span class='ident'>BigNum</span>(<span class='kw-2'>ref</span> <span class='ident'>n</span>) <span class='op'>=</span> <span class='op'>*</span><span class='self'>self</span>;
        <span class='ident'>n</span>
    }

    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>into_raw</span>(<span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='op'>*</span><span class='kw-2'>mut</span> <span class='ident'>ffi</span>::<span class='ident'>BIGNUM</span> {
        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>me</span> <span class='op'>=</span> <span class='self'>self</span>;
        <span class='ident'>mem</span>::<span class='ident'>replace</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>me</span>.<span class='number'>0</span>, <span class='ident'>ptr</span>::<span class='ident'>null_mut</span>())
    }

    <span class='doccomment'>/// Returns a big-endian byte vector representation of the absolute value of `self`.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// `self` can be recreated by using `new_from_slice`.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// ```</span>
    <span class='doccomment'>/// # use openssl::bn::BigNum;</span>
    <span class='doccomment'>/// let s = -BigNum::new_from(4543).unwrap();</span>
    <span class='doccomment'>/// let r = BigNum::new_from(4543).unwrap();</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// let s_vec = s.to_vec();</span>
    <span class='doccomment'>/// assert_eq!(BigNum::new_from_slice(&amp;s_vec).unwrap(), r);</span>
    <span class='doccomment'>/// ```</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>to_vec</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>Vec</span><span class='op'>&lt;</span><span class='ident'>u8</span><span class='op'>&gt;</span> {
        <span class='kw'>let</span> <span class='ident'>size</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>num_bytes</span>() <span class='kw'>as</span> <span class='ident'>usize</span>;
        <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='ident'>Vec</span>::<span class='ident'>with_capacity</span>(<span class='ident'>size</span>);
        <span class='kw'>unsafe</span> {
            <span class='ident'>ffi</span>::<span class='ident'>BN_bn2bin</span>(<span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>v</span>.<span class='ident'>as_mut_ptr</span>());
            <span class='ident'>v</span>.<span class='ident'>set_len</span>(<span class='ident'>size</span>);
        }
        <span class='ident'>v</span>
    }

    <span class='doccomment'>/// Returns a decimal string representation of `self`.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// ```</span>
    <span class='doccomment'>/// # use openssl::bn::BigNum;</span>
    <span class='doccomment'>/// let s = -BigNum::new_from(12345).unwrap();</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// assert_eq!(s.to_dec_str(), &quot;-12345&quot;);</span>
    <span class='doccomment'>/// ```</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>to_dec_str</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>String</span> {
        <span class='kw'>unsafe</span> {
            <span class='kw'>let</span> <span class='ident'>buf</span> <span class='op'>=</span> <span class='ident'>ffi</span>::<span class='ident'>BN_bn2dec</span>(<span class='self'>self</span>.<span class='ident'>raw</span>());
            <span class='macro'>assert</span><span class='macro'>!</span>(<span class='op'>!</span><span class='ident'>buf</span>.<span class='ident'>is_null</span>());
            <span class='kw'>let</span> <span class='ident'>str</span> <span class='op'>=</span> <span class='ident'>String</span>::<span class='ident'>from_utf8</span>(<span class='ident'>CStr</span>::<span class='ident'>from_ptr</span>(<span class='ident'>buf</span> <span class='kw'>as</span> <span class='op'>*</span><span class='kw'>const</span> _).<span class='ident'>to_bytes</span>().<span class='ident'>to_vec</span>())
                          .<span class='ident'>unwrap</span>();
            <span class='ident'>ffi</span>::<span class='ident'>CRYPTO_free</span>(<span class='ident'>buf</span> <span class='kw'>as</span> <span class='op'>*</span><span class='kw-2'>mut</span> <span class='ident'>c_void</span>);
            <span class='ident'>str</span>
        }
    }

    <span class='doccomment'>/// Returns a hexadecimal string representation of `self`.</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// ```</span>
    <span class='doccomment'>/// # use openssl::bn::BigNum;</span>
    <span class='doccomment'>/// let s = -BigNum::new_from(0x99ff).unwrap();</span>
    <span class='doccomment'>///</span>
    <span class='doccomment'>/// assert_eq!(s.to_hex_str(), &quot;-99FF&quot;);</span>
    <span class='doccomment'>/// ```</span>
    <span class='kw'>pub</span> <span class='kw'>fn</span> <span class='ident'>to_hex_str</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>String</span> {
        <span class='kw'>unsafe</span> {
            <span class='kw'>let</span> <span class='ident'>buf</span> <span class='op'>=</span> <span class='ident'>ffi</span>::<span class='ident'>BN_bn2hex</span>(<span class='self'>self</span>.<span class='ident'>raw</span>());
            <span class='macro'>assert</span><span class='macro'>!</span>(<span class='op'>!</span><span class='ident'>buf</span>.<span class='ident'>is_null</span>());
            <span class='kw'>let</span> <span class='ident'>str</span> <span class='op'>=</span> <span class='ident'>String</span>::<span class='ident'>from_utf8</span>(<span class='ident'>CStr</span>::<span class='ident'>from_ptr</span>(<span class='ident'>buf</span> <span class='kw'>as</span> <span class='op'>*</span><span class='kw'>const</span> _).<span class='ident'>to_bytes</span>().<span class='ident'>to_vec</span>())
                          .<span class='ident'>unwrap</span>();
            <span class='ident'>ffi</span>::<span class='ident'>CRYPTO_free</span>(<span class='ident'>buf</span> <span class='kw'>as</span> <span class='op'>*</span><span class='kw-2'>mut</span> <span class='ident'>c_void</span>);
            <span class='ident'>str</span>
        }
    }
}

<span class='kw'>impl</span> <span class='ident'>fmt</span>::<span class='ident'>Debug</span> <span class='kw'>for</span> <span class='ident'>BigNum</span> {
    <span class='kw'>fn</span> <span class='ident'>fmt</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>f</span>: <span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='ident'>fmt</span>::<span class='ident'>Formatter</span>) <span class='op'>-&gt;</span> <span class='ident'>fmt</span>::<span class='prelude-ty'>Result</span> {
        <span class='macro'>write</span><span class='macro'>!</span>(<span class='ident'>f</span>, <span class='string'>&quot;{}&quot;</span>, <span class='self'>self</span>.<span class='ident'>to_dec_str</span>())
    }
}

<span class='kw'>impl</span> <span class='ident'>Eq</span> <span class='kw'>for</span> <span class='ident'>BigNum</span> {}
<span class='kw'>impl</span> <span class='ident'>PartialEq</span> <span class='kw'>for</span> <span class='ident'>BigNum</span> {
    <span class='kw'>fn</span> <span class='ident'>eq</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>oth</span>: <span class='kw-2'>&amp;</span><span class='ident'>BigNum</span>) <span class='op'>-&gt;</span> <span class='ident'>bool</span> {
        <span class='kw'>unsafe</span> { <span class='ident'>ffi</span>::<span class='ident'>BN_cmp</span>(<span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>oth</span>.<span class='ident'>raw</span>()) <span class='op'>==</span> <span class='number'>0</span> }
    }
}

<span class='kw'>impl</span> <span class='ident'>Ord</span> <span class='kw'>for</span> <span class='ident'>BigNum</span> {
    <span class='kw'>fn</span> <span class='ident'>cmp</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>oth</span>: <span class='kw-2'>&amp;</span><span class='ident'>BigNum</span>) <span class='op'>-&gt;</span> <span class='ident'>Ordering</span> {
        <span class='self'>self</span>.<span class='ident'>partial_cmp</span>(<span class='ident'>oth</span>).<span class='ident'>unwrap</span>()
    }
}

<span class='kw'>impl</span> <span class='ident'>PartialOrd</span> <span class='kw'>for</span> <span class='ident'>BigNum</span> {
    <span class='kw'>fn</span> <span class='ident'>partial_cmp</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>, <span class='ident'>oth</span>: <span class='kw-2'>&amp;</span><span class='ident'>BigNum</span>) <span class='op'>-&gt;</span> <span class='prelude-ty'>Option</span><span class='op'>&lt;</span><span class='ident'>Ordering</span><span class='op'>&gt;</span> {
        <span class='kw'>unsafe</span> {
            <span class='kw'>let</span> <span class='ident'>v</span> <span class='op'>=</span> <span class='ident'>ffi</span>::<span class='ident'>BN_cmp</span>(<span class='self'>self</span>.<span class='ident'>raw</span>(), <span class='ident'>oth</span>.<span class='ident'>raw</span>());
            <span class='kw'>let</span> <span class='ident'>ret</span> <span class='op'>=</span> <span class='kw'>if</span> <span class='ident'>v</span> <span class='op'>==</span> <span class='number'>0</span> {
                <span class='ident'>Ordering</span>::<span class='ident'>Equal</span>
            } <span class='kw'>else</span> <span class='kw'>if</span> <span class='ident'>v</span> <span class='op'>&lt;</span> <span class='number'>0</span> {
                <span class='ident'>Ordering</span>::<span class='ident'>Less</span>
            } <span class='kw'>else</span> {
                <span class='ident'>Ordering</span>::<span class='ident'>Greater</span>
            };
            <span class='prelude-val'>Some</span>(<span class='ident'>ret</span>)
        }
    }
}

<span class='kw'>impl</span> <span class='ident'>Drop</span> <span class='kw'>for</span> <span class='ident'>BigNum</span> {
    <span class='kw'>fn</span> <span class='ident'>drop</span>(<span class='kw-2'>&amp;</span><span class='kw-2'>mut</span> <span class='self'>self</span>) {
        <span class='kw'>unsafe</span> {
            <span class='kw'>if</span> <span class='op'>!</span><span class='self'>self</span>.<span class='ident'>raw</span>().<span class='ident'>is_null</span>() {
                <span class='ident'>ffi</span>::<span class='ident'>BN_clear_free</span>(<span class='self'>self</span>.<span class='ident'>raw</span>());
            }
        }
    }
}

<span class='attribute'>#[<span class='ident'>doc</span>(<span class='ident'>hidden</span>)]</span>      <span class='comment'>// This module only contains impls, so it&#39;s empty when generating docs</span>
<span class='kw'>pub</span> <span class='kw'>mod</span> <span class='ident'>unchecked</span> {
    <span class='kw'>use</span> <span class='ident'>std</span>::<span class='ident'>ops</span>::{<span class='ident'>Add</span>, <span class='ident'>Div</span>, <span class='ident'>Mul</span>, <span class='ident'>Neg</span>, <span class='ident'>Rem</span>, <span class='ident'>Shl</span>, <span class='ident'>Shr</span>, <span class='ident'>Sub</span>};
    <span class='kw'>use</span> <span class='ident'>ffi</span>;
    <span class='kw'>use</span> <span class='kw'>super</span>::<span class='ident'>BigNum</span>;

    <span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>Add</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>BigNum</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>BigNum</span> {
        <span class='kw'>type</span> <span class='ident'>Output</span> <span class='op'>=</span> <span class='ident'>BigNum</span>;

        <span class='kw'>fn</span> <span class='ident'>add</span>(<span class='self'>self</span>, <span class='ident'>oth</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>BigNum</span>) <span class='op'>-&gt;</span> <span class='ident'>BigNum</span> {
            <span class='self'>self</span>.<span class='ident'>checked_add</span>(<span class='ident'>oth</span>).<span class='ident'>unwrap</span>()
        }
    }

    <span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>Sub</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>BigNum</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>BigNum</span> {
        <span class='kw'>type</span> <span class='ident'>Output</span> <span class='op'>=</span> <span class='ident'>BigNum</span>;

        <span class='kw'>fn</span> <span class='ident'>sub</span>(<span class='self'>self</span>, <span class='ident'>oth</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>BigNum</span>) <span class='op'>-&gt;</span> <span class='ident'>BigNum</span> {
            <span class='self'>self</span>.<span class='ident'>checked_sub</span>(<span class='ident'>oth</span>).<span class='ident'>unwrap</span>()
        }
    }

    <span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>Mul</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>BigNum</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>BigNum</span> {
        <span class='kw'>type</span> <span class='ident'>Output</span> <span class='op'>=</span> <span class='ident'>BigNum</span>;

        <span class='kw'>fn</span> <span class='ident'>mul</span>(<span class='self'>self</span>, <span class='ident'>oth</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>BigNum</span>) <span class='op'>-&gt;</span> <span class='ident'>BigNum</span> {
            <span class='self'>self</span>.<span class='ident'>checked_mul</span>(<span class='ident'>oth</span>).<span class='ident'>unwrap</span>()
        }
    }

    <span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>Div</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>BigNum</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>BigNum</span> {
        <span class='kw'>type</span> <span class='ident'>Output</span> <span class='op'>=</span> <span class='ident'>BigNum</span>;

        <span class='kw'>fn</span> <span class='ident'>div</span>(<span class='self'>self</span>, <span class='ident'>oth</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>BigNum</span>) <span class='op'>-&gt;</span> <span class='ident'>BigNum</span> {
            <span class='self'>self</span>.<span class='ident'>checked_div</span>(<span class='ident'>oth</span>).<span class='ident'>unwrap</span>()
        }
    }

    <span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>Rem</span><span class='op'>&lt;</span><span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>BigNum</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>BigNum</span> {
        <span class='kw'>type</span> <span class='ident'>Output</span> <span class='op'>=</span> <span class='ident'>BigNum</span>;

        <span class='kw'>fn</span> <span class='ident'>rem</span>(<span class='self'>self</span>, <span class='ident'>oth</span>: <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>BigNum</span>) <span class='op'>-&gt;</span> <span class='ident'>BigNum</span> {
            <span class='self'>self</span>.<span class='ident'>checked_mod</span>(<span class='ident'>oth</span>).<span class='ident'>unwrap</span>()
        }
    }

    <span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>Shl</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>BigNum</span> {
        <span class='kw'>type</span> <span class='ident'>Output</span> <span class='op'>=</span> <span class='ident'>BigNum</span>;

        <span class='kw'>fn</span> <span class='ident'>shl</span>(<span class='self'>self</span>, <span class='ident'>n</span>: <span class='ident'>i32</span>) <span class='op'>-&gt;</span> <span class='ident'>BigNum</span> {
            <span class='self'>self</span>.<span class='ident'>checked_shl</span>(<span class='kw-2'>&amp;</span><span class='ident'>n</span>).<span class='ident'>unwrap</span>()
        }
    }

    <span class='kw'>impl</span><span class='op'>&lt;</span><span class='lifetime'>&#39;a</span><span class='op'>&gt;</span> <span class='ident'>Shr</span><span class='op'>&lt;</span><span class='ident'>i32</span><span class='op'>&gt;</span> <span class='kw'>for</span> <span class='kw-2'>&amp;</span><span class='lifetime'>&#39;a</span> <span class='ident'>BigNum</span> {
        <span class='kw'>type</span> <span class='ident'>Output</span> <span class='op'>=</span> <span class='ident'>BigNum</span>;

        <span class='kw'>fn</span> <span class='ident'>shr</span>(<span class='self'>self</span>, <span class='ident'>n</span>: <span class='ident'>i32</span>) <span class='op'>-&gt;</span> <span class='ident'>BigNum</span> {
            <span class='self'>self</span>.<span class='ident'>checked_shr</span>(<span class='kw-2'>&amp;</span><span class='ident'>n</span>).<span class='ident'>unwrap</span>()
        }
    }

    <span class='kw'>impl</span> <span class='ident'>Clone</span> <span class='kw'>for</span> <span class='ident'>BigNum</span> {
        <span class='kw'>fn</span> <span class='ident'>clone</span>(<span class='kw-2'>&amp;</span><span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>BigNum</span> {
            <span class='kw'>unsafe</span> {
                <span class='kw'>let</span> <span class='ident'>r</span> <span class='op'>=</span> <span class='ident'>ffi</span>::<span class='ident'>BN_dup</span>(<span class='self'>self</span>.<span class='ident'>raw</span>());
                <span class='kw'>if</span> <span class='ident'>r</span>.<span class='ident'>is_null</span>() {
                    <span class='macro'>panic</span><span class='macro'>!</span>(<span class='string'>&quot;Unexpected null pointer from BN_dup(..)&quot;</span>)
                } <span class='kw'>else</span> {
                    <span class='ident'>BigNum</span>(<span class='ident'>r</span>)
                }
            }
        }
    }

    <span class='kw'>impl</span> <span class='ident'>Neg</span> <span class='kw'>for</span> <span class='ident'>BigNum</span> {
        <span class='kw'>type</span> <span class='ident'>Output</span> <span class='op'>=</span> <span class='ident'>BigNum</span>;

        <span class='kw'>fn</span> <span class='ident'>neg</span>(<span class='self'>self</span>) <span class='op'>-&gt;</span> <span class='ident'>BigNum</span> {
            <span class='kw'>let</span> <span class='kw-2'>mut</span> <span class='ident'>n</span> <span class='op'>=</span> <span class='self'>self</span>.<span class='ident'>clone</span>();
            <span class='ident'>n</span>.<span class='ident'>negate</span>();
            <span class='ident'>n</span>
        }
    }
}

<span class='attribute'>#[<span class='ident'>cfg</span>(<span class='ident'>test</span>)]</span>
<span class='kw'>mod</span> <span class='ident'>tests</span> {
    <span class='kw'>use</span> <span class='ident'>bn</span>::<span class='ident'>BigNum</span>;

    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_to_from_slice</span>() {
        <span class='kw'>let</span> <span class='ident'>v0</span> <span class='op'>=</span> <span class='ident'>BigNum</span>::<span class='ident'>new_from</span>(<span class='number'>10203004_u64</span>).<span class='ident'>unwrap</span>();
        <span class='kw'>let</span> <span class='ident'>vec</span> <span class='op'>=</span> <span class='ident'>v0</span>.<span class='ident'>to_vec</span>();
        <span class='kw'>let</span> <span class='ident'>v1</span> <span class='op'>=</span> <span class='ident'>BigNum</span>::<span class='ident'>new_from_slice</span>(<span class='kw-2'>&amp;</span><span class='ident'>vec</span>).<span class='ident'>unwrap</span>();

        <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>v0</span> <span class='op'>==</span> <span class='ident'>v1</span>);
    }

    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_negation</span>() {
        <span class='kw'>let</span> <span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>BigNum</span>::<span class='ident'>new_from</span>(<span class='number'>909829283_u64</span>).<span class='ident'>unwrap</span>();

        <span class='macro'>assert</span><span class='macro'>!</span>(<span class='op'>!</span><span class='ident'>a</span>.<span class='ident'>is_negative</span>());
        <span class='macro'>assert</span><span class='macro'>!</span>((<span class='op'>-</span><span class='ident'>a</span>).<span class='ident'>is_negative</span>());
    }


    <span class='attribute'>#[<span class='ident'>test</span>]</span>
    <span class='kw'>fn</span> <span class='ident'>test_prime_numbers</span>() {
        <span class='kw'>let</span> <span class='ident'>a</span> <span class='op'>=</span> <span class='ident'>BigNum</span>::<span class='ident'>new_from</span>(<span class='number'>19029017_u64</span>).<span class='ident'>unwrap</span>();
        <span class='kw'>let</span> <span class='ident'>p</span> <span class='op'>=</span> <span class='ident'>BigNum</span>::<span class='ident'>checked_generate_prime</span>(<span class='number'>128</span>, <span class='bool-val'>true</span>, <span class='prelude-val'>None</span>, <span class='prelude-val'>Some</span>(<span class='kw-2'>&amp;</span><span class='ident'>a</span>)).<span class='ident'>unwrap</span>();

        <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>p</span>.<span class='ident'>is_prime</span>(<span class='number'>100</span>).<span class='ident'>unwrap</span>());
        <span class='macro'>assert</span><span class='macro'>!</span>(<span class='ident'>p</span>.<span class='ident'>is_prime_fast</span>(<span class='number'>100</span>, <span class='bool-val'>true</span>).<span class='ident'>unwrap</span>());
    }
}
</pre>
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